US2561537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide range permeability system
Assignee: RCA Corp
•
Filing: 1946-08-14
•
Granted: 1951-07-24
•
Expires: 1966-08-14
Abstract
No abstract record available.
Inventors
- 👤 William F Sands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:44
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/02; H01F21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1639662A
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US1647736A
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US1661953A
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US1704215A
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US1978600A
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US2095420A
Cited
US2213328A
Cited
US2276617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |